| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | Period [Axis] |
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2015-01-01 - 2015-12-31 |
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
Weighted-Average Assumptions to Estimate Fair Value |
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Years Ended December 31,
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2015
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2014
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2013
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Expected stock price volatility
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61.22
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%
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58.47
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%
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82.81
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%
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Risk-free interest rate
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1.63
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%
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1.91
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%
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1.24
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%
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Expected life of options (years)
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6.21
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6.26
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6.14
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Expected dividend yield
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-
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-
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-
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Summary of Stock Option Activity |
The Company’s stock option activity for the year ended December 31, 2015 is as follows (in thousands, except per share amounts):
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Weighted
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Weighted-
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Average
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Average
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Remaining
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Aggregate
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Number of
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Exercise Price
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Contractual
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Intrinsic
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Stock Options
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Per Share
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Life (years)
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Value
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Outstanding at December 31, 2014
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6,409
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$
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28.03
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7.6
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$
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26,946
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Granted
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2,306
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$
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21.22
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Exercised
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(961)
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$
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4.43
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Forfeited/cancelled
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(1,519)
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$
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35.57
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Outstanding at December 31, 2015
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6,235
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$
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27.32
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6.5
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$
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33
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Vested and expected to vest at December 31, 2015
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5,298
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$
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27.50
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6.0
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$
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33
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Exercisable at December 31, 2015
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3,233
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$
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26.87
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4.4
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$
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33
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Summary of Restricted Stock Units Activity |
The Company’s RSU activity for the year ended December 31, 2015 is as follows (in thousands, except per share amounts):
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Weighted
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Weighted-
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Average
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Average
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Remaining
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Number of
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Grant Date
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Contractual
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RSUs
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Fair Value
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Life (years)
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Outstanding at December 31, 2014
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266
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$
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31.64
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2.2
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Granted
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608
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$
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21.87
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Vested
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(57)
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$
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33.40
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Forfeited/cancelled
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(201)
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$
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26.68
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Outstanding at December 31, 2015
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616
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$
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23.45
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1.6
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Allocation of Stock-Based Compensation Expense by Type of Award |
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Years Ending December 31,
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2015
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2014
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2013
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(in thousands)
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Stock-based compensation expense by type of award:
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Stock options
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$
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21,255
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$
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29,095
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$
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26,750
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Restricted stock units
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3,093
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1,282
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1,170
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Less stock-based compensation capitalized to inventories
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(355)
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(502)
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(270)
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Total stock-based compensation expense included in costs and expenses
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$
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23,993
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$
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29,875
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$
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27,650
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Allocation of Stock-Based Compensation Expense to Statements of Operations |
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Years Ending December 31,
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2015
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2014
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2013
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(in thousands)
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Selling, general and administrative
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$
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19,977
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$
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24,978
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$
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20,404
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Research and development
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4,016
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4,897
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7,246
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Total stock-based compensation expense included in costs and expenses
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$
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23,993
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$
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29,875
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$
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27,650
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